Comments: Three phases found. Uncorrected alunite 2 theta values
were refined to a hexagonal/rhombohedral unit cell having a=7.301
(2) and c=17.050(7). These dimensions and the yellowish ochre color
suggest that the alunite is Fe-rich; the pattern closely matches
that of K-jarosite except that the strong (012) reflection is
missing. There is no evidence of the double cell (c=33.8 Angstroms)
characteristic of plumbojarosite (in which a large divalent cation
replaces the alkali).

Comparison with a spectrum of cerussite indicates that any cerussite
is not detected spectrally. Since the spectral features of this
sample differ from those of low temperature K-jarosite (GDS98), this
may indicate the presence of Pb in the sample. Because this sample
also contains some cerussite, any chemical analysis must be done on
the jarosite portion only. This has yet to be done. G. Swayze.